Add TVB ContentTypes

[UlrikeS91]

from issue #7

Resources:

• https://www.thevirtualbrain.org/tvb/zwei/ (webpage)
• https://www.thevirtualbrain.org/tvb/zwei/brainsimulator-data (file format specifications for input and output)
• https://search.kg.ebrains.eu/instances/615edae7-2697-49cf-b730-5b02bb652969 (KG model, same as above)

Info:

• import: "TVB projects or single data types: TVB's own ZIP/HDF5 format"
• export:
  • data:
    • internally stored: HDF5
    • export entire project: zip (contains folder structure following data types of TVB software, xml file as guide for folder structure, hdf5 files for each data type)
    • export individual HDF5 files
  • simulation config:
    • export config setup as JSON
  • visualizer graphics (from TVB's visualizers):
    • download images as PNG
    • some visualizers are built with vector graphics - export SVG from those

Instances:

• application_vnd.TVB+zip
• application_vnd.TVB+xml
• application_vnd.TVB.simulation+json
• maybe:
  • application_vnd.TVB+hdf5
  • application_vnd.TVB.visualizer+png
  • application_vnd.TVB.visualizer+svg

I'm not sure if the hdf5, png and svg are special for the TVB software. hdf5 is very possible, bt I doubt if for png or svg.